JP2018502243A - Suction acoustic filter and suction line including suction acoustic filter - Google Patents

Abstract

The present invention relates to the technical field of acoustic filters applied to hermetic compressors. Problem to be solved: In a hermetic compressor applied to a cooling system, the working fluid sucked by the compression mechanism is hotter than the working fluid flowing in from the evaporator, and the higher the temperature of this fluid, It is known that efficiency is lowered. Solving the problem: Ensuring that the compression mechanism operates using primarily the working fluid flowing from the evaporator, which is cooler than the working fluid stored inside the environment defined by the sealed housing of the compressor A suction acoustic filter and a suction line including this acoustic filter that can be identified are identified.

Description

  The present invention relates to acoustic filters for hermetic compressors, and more particularly to a suction acoustic filter with a nozzle for minimizing suction of working fluid at high temperatures. Furthermore, the present invention relates to a suction line for a hermetic compressor including a suction acoustic filter including a nozzle for minimizing suction of working fluid at high temperatures.

  In general, the main objective of the subject invention relates to the functional optimization of a hermetic compressor that minimizes the amount of hot working fluid that is drawn into the compression mechanism (piston-cylinder set).

  As known to those skilled in the art, hermetic compressors include an electromechanical device that can compress the working fluid by a continuous change in the internal volume of the compression chamber. Hermetic compressors are mainly applied to cooling systems.

  This continuous volume change is performed by a compression mechanism basically integrated by a piston / cylinder set in a reciprocating hermetic compressor, and the piston moves back and forth in the axial direction inside the cylinder. And change its volume. It should be noted that the compression mechanism is enclosed within the hermetic housing of the compressor.

  Due to the reciprocating motion of the piston, it can be said that the reciprocating hermetic compressor operates in a working fluid suction and exhaust reciprocating cycle.

  Of the multiple functional variables present in hermetic compressors, two of these functional variables are considered in view of the scope of this application.

  The first functional variable considered refers to the temperature of the working fluid sucked by the compression mechanism, the higher the temperature of this fluid, the lower the yield of the compressor. In addition to being widely described by technical specialist literature, this functional variable is also widely known by those skilled in the art.

  The current state of the art includes several solutions, in particular for optimizing the first functional variable, i.e. specifically for cooling the working fluid temperature drawn by the compression mechanism. For example, Brazilian Patent Publication No. 1100396 describes the application of a pre-evaporator inside the hermetic housing of the compressor, the main purpose of which is to reduce the temperature of the compression mechanism, Or further, the temperature of the working fluid sucked by the compression mechanism is lowered.

  The second functional variable to address next is the noise level generated during closed compressor operation, which refers to the noise that can come from different sources. The reciprocation between the intake and exhaust cycles during compressor operation is itself characterized by the generation of highly undesirable vibrations and pulse noise.

  The current state of the art is already known in particular for optimizing the second functional variable, ie several solutions for specifically attenuating the pulse noise produced by the suction and exhaust cycles, as well as solutions The known solutions with suction acoustic filters are emphasized, including several solutions for smog. Suction acoustic filters are widely known to those skilled in the art beyond being widely described in specific technical literature. In general, a suction acoustic filter is placed in one part of the suction line and has a large volume (related to the volume of the suction line part) that can minimize the pulse effects associated with reciprocation between suction cycles. A chamber is defined. Such functional principles are widely known and applied in reciprocating hermetic compressors. The functional origin of the suction acoustic filter is unchanged, but the possibilities of construction and assembly are wide. Embodiments of sealed suction acoustic filters (applied to sealed or direct suction lines) and non-sealed suction acoustic filters (applied to uniform or indirect suction lines and also applied to semi-direct suction lines) It has been known.

  Various models of the suction acoustic filter, including various purposes, are shown in FIGS.

  The suction acoustic filter schematically illustrated in FIG. 1 relates to a typical embodiment for the current state of the art. Such an acoustic filter is entirely integrated by the auxiliary chamber A and the main chamber B. The preliminary chamber A includes a fluid inlet region A1 and a fluid outlet region A2, while the main chamber B includes a fluid inlet tube B1 and a fluid outlet tube B2. As shown, the beginning of the fluid outlet region A2 of the auxiliary chamber A and the fluid inlet tube B1 of the main chamber B is indistinguishable between them because both are in fluid communication. is there. Generally, the spare chamber A has only a fluid confinement function, while the main chamber B has a pulse attenuation function. Accordingly, it can be said that the suction acoustic filter schematically shown in FIG. 1 does not include any features, characteristics or implementations for optimizing the functional variables related to the working fluid temperature sucked by the compression mechanism.

  The suction acoustic filter illustrated in FIG. 2 relates to the suction acoustic filter described in Japanese Patent Laid-Open No. 2001-055976, and describes the suction acoustic filter defined by the inlet C1, the internal volume C2, and the outlet C3. Such a suction acoustic filter cooperates in particular with the extension D originating from the suction passage. One of the main ideas found in JP 2001-055976 is that the suction acoustic filter obtains a working fluid free from the final turbulence present in the environment defined inside the hermetic housing of the compressor ( Is supplied). Again, no features, aspects or implementations are mentioned for optimizing the function variables related to the working fluid temperature sucked by the compression mechanism.

  The suction acoustic filter shown in FIG. 3 relates to the suction acoustic filter described in Korean Patent No. 2002-0027794, and the suction acoustic filter defined by the nozzle F1, the inlet pipe F4, the internal volume F2, and the outlet F3. The filter is described and the nozzle F1 is convergent, ie the inlet area is larger than the outlet area.

  Beyond the examples listed above and with current understanding in mind, the current state of the art is optimized for the two functional variables described above, implemented in a suction acoustic filter. It can be seen that there is a lack of a unified solution that should be. Based on this situation, the subject invention arises.

Brazilian Patent Application Publication No. 1100396 JP 2001-055976 A Korean Patent No. 2002-0027794

  Thus, one of the objects of the invention of interest is a suction acoustic filter that includes different nozzles and is capable of sucking and confining working fluid at a temperature lower than that of the working fluid present in the internal environment of the enclosed housing. Thus, in a system that can cool the temperature of the working fluid sucked by the compression mechanism, it reaches a major part of the observed benefits. It is also an object of the present invention that the suction acoustic filter, including the nozzle, reaches maximum optimization when it relates to the pulse noise attenuation produced by the suction and exhaust cycles.

  In addition, one of the objects of the present invention of interest can optimize the function of the hermetic compressor, in particular, the temperature drop of the working fluid sucked by the compression mechanism, and between the suction and exhaust cycles. From the reduction of the noise generated by the reciprocating motion of the compressor, the suction line including the suction acoustic filter (including the nozzle) that can optimize the efficiency of the hermetic compressor is clarified.

  In connection with this situation, one of the main objectives of the present invention is that these optimizations can be achieved simply and inexpensively without the need for additional equipment and / or systems. It is.

  All objects of the subject invention are directed to at least one inlet path, at least one acoustic chamber, at least one outlet path, and at least one inlet path, for the inlet path of the acoustic suction filter. This is achieved by a suction acoustic filter comprising at least one fluid inlet and at least one nozzle comprising at least one fluid guiding region.

  In accordance with the subject invention, the nozzle includes at least a portion of a diverging section associated with the main stream of outflow, which portion is located between at least one fluid inlet region and at least one fluid guiding region.

  Furthermore, according to the subject invention, the suction line is integrated by at least one suction passage, as well as at least one inlet path, at least one acoustic chamber, at least one outlet path, Including at least one suction acoustic filter in fluid communication with at least one inlet path and comprising at least one fluid inlet region for the inlet path of the suction acoustic filter and at least one nozzle with at least one fluid guiding region. Is revealed. The nozzle of the suction acoustic filter includes at least a portion of a diverging section associated with the main stream of outflow, and this portion is located between at least one fluid inlet region and at least one fluid guiding region.

  According to the subject invention, the suction passage outlet is located adjacent to the fluid inlet region of the nozzle of the suction acoustic filter.

  The present invention will be described in detail with reference to the drawings listed below.

It is the schematic of the suction acoustic filter relevant to the present technical level. It is a figure which shows the suction acoustic filter detailed in Unexamined-Japanese-Patent No. 2001-055976 (latest technique). It is a figure which shows the suction | inhalation acoustic filter detailed in the Korean patent 2002-0027794 (latest technology). FIG. 2 shows a suction acoustic filter including a nozzle, according to a preferred embodiment of the subject invention. FIG. 6 shows a suction acoustic filter including a nozzle, according to an alternative embodiment of the subject invention. FIG. 2 is an enlarged detail view showing a subject nozzle according to the invention. FIG. 6 shows another alternative for a suction acoustic filter including a nozzle according to the subject invention. FIG. 6 shows another alternative for a suction acoustic filter including a nozzle according to the subject invention. FIG. 6 is a schematic diagram illustrating an operational “situation” in which a suction acoustic filter including a nozzle is exposed. It is the schematic which shows the operation | movement "situation" where the suction acoustic filter containing a nozzle was exposed. 12 is a temperature comparison graph between a suction acoustic filter including a nozzle according to a preferred embodiment of the subject invention (see FIG. 11B) and a suction acoustic filter already established in the patent literature (see FIG. 11C). FIG. 2 shows a suction acoustic filter including a nozzle according to a preferred embodiment of the present invention. It is a figure which shows the suction acoustic filter already established by the patent document.

  As already mentioned, the current state of the art includes several solutions aimed specifically at cooling the compression mechanism, or also cooling means of the working fluid sucked by the compression mechanism. Such cooling solutions have so far been able to keep the compression mechanism cooler, but also involve energy costs that can compromise the efficiency of the compressor.

  Before explaining the details of the subject embodiment of the present invention, it is important to define precisely the meanings of the expressions "mainstream of outflow" and "pulse backflow" used below as a descriptive reference.

  Outflow mainstream (FPE): A gas stream traveling from the suction passage to the compression chamber.

  Pulsed reverse flow (RP): A gas flow that returns from the compression chamber to the inside of the suction acoustic filter and eventually returns to the outside of the suction acoustic filter by a dynamic valve.

  Therefore, it is a great advantage of the subject invention to keep the compression mechanism of the hermetic compressor cooler without the need to use cooling means.

  Therefore, in the subject invention, the fluid flowing directly from the suction passage of the compressor, which is fluid flowing from the evaporation line (showing a lower temperature than the working fluid enclosed in the internal environment defined by the hermetic housing of the compressor) The subject invention is emphasized because it reveals a means by which it can be ensured that only working fluid (or at least primarily) is drawn by the compression mechanism.

  In general, such means are basically constituted by a nozzle that is preferentially (but not limited to) arranged in the outer part of the suction acoustic filter and is in fluid communication with the inlet path of said suction acoustic filter. The nozzle can act as a sort of working fluid collector that flows directly from the compressor suction passage, while at the same time sucking in working fluid enclosed in the internal environment defined by the compressor enclosed housing Can act as a kind of barrier. In other words, the nozzle end functions as a “cold fluid trap” to prevent (or make difficult) the cryogenic fluid (directly flowing from the compressor suction passage) thermally homogeneous, The working fluid is enclosed in an internal environment defined by the hermetic housing of the compressor.

  The object of the present invention will be explored in more detail based on exemplary FIGS. 4, 5, 6, 7, 8, 9, and 10. FIG.

  In this sense, the preferred embodiment of the present invention of interest (FIG. 4) includes an inlet path 11, a main chamber 12 that includes the ability to attenuate fluid flow pulses (and consequently noise attenuation), and a compression mechanism head (not shown). 1) and the suction acoustic filter 1 that is basically formed by an outlet passage 13 that is functionally similar.

  It is worth mentioning that the suction acoustic filter 1 generally comprises a conventional suction acoustic filter, also a general suction acoustic filter. This means that the subject inventive center (detailed below) can be applied to multiple models and configurations of suction acoustic filters, such that such filters have at least one inlet path 11. And at least one main chamber 12 and at least one outlet passage 13. Preferably, as shown in FIG. 4, the inlet path 11 and the outlet 13 are disposed apart from each other, and the inlet path 11 is disposed on the side of the suction acoustic filter 1.

  The suction acoustic filter 1 includes a nozzle 2 that is in fluid communication with at least one inlet passage 11 and includes a fluid inlet region 21 and a fluid induction region 22 for the inlet passage 11 of the suction acoustic filter 1.

  Furthermore, according to the subject invention, the nozzle 2 of the suction acoustic filter 1 comprises a part of the diverging section associated with the main flow (FPE) of the outflow.

  As shown in FIGS. 4, 5 and 6, the portion of the diverging compartment 23 associated with the main flow (FPE) of the outflow includes its own fluid inlet 21 having a smaller area than the fluid directing region 22. In particular, according to a preferred embodiment of the present invention, the inlet area of the nozzle 21 is at most 50% smaller than the fluid guiding area 22.

  In FIGS. 7 and 8 illustrating possible alternative embodiments, that is, the portion of the diverging section 23 associated with the main flow (FPE) of the outflow is some narrow portion or restriction associated with the pulsed backflow direction (RP). The fluid inlet region 21 is larger than the fluid guiding region 22.

  The presence of the diverging section portion 23 associated with the main flow of effluent (FPE) is present on the fluid inlet region 21 of the nozzle 2 itself or between the fluid inlet region 21 and the fluid guiding region 22, which is the subject book. It is one of the most preferential features of the invention, which ultimately results in a working fluid trap where the region flows directly from the compressor suction passage and into the internal environment defined by the hermetic housing of the compressor. The area that is reduced in relation to the pulsed reverse flow (RP) that defines the barrier to the suction of the encapsulated working fluid.

  As shown in FIG. 9, it can be said that the nozzle 2 defines a volume including at least one divergent portion, taking into account the direction of the main flow (FPE) of the outflow. In this way, the fluid flowing in from the suction passage is guided and stored inside the nozzle 2, and then enters the suction acoustic filter 1 by the inlet passage 11 through which the fluid guiding region 22 of the nozzle 2 communicates. To FS. It is further confirmed that, at best, the “housing fluid” FC is mainly prevented from entering the nozzle 2.

  As illustrated in FIG. 10, nozzle 2 can be said to define a volume that includes at least one converging portion, and then consider the direction of pulsed backflow (RP). As a result, the outflow of the pulse backflow (RP) at a low temperature is blocked or made difficult with respect to the environment outside the nozzle 2.

  Since the suction movability of the reciprocating hermetic compressor is basically constant (pulsed at a high frequency), the temperature of the “suction fluid” FS rises in relation to the temperature of the mainstream fluid (FPE) that flows out. I don't have enough time. In this way, the volume of the nozzle 2 results in functioning as a working fluid accumulator at “low” temperatures.

  This thermodynamic enhancement effect by a suction line including a suction acoustic filter as defined herein is another significant advantage of the subject invention.

  According to the suction line including the suction acoustic filter disclosed in this specification, the suction passage 3 of the hermetic compressor 31 shown in FIG. 4 is adjacent to the fluid inlet region 21 of the nozzle 2 of the suction acoustic filter 1. Provide an exit. Obviously, when the suction passage 3 of the hermetic compressor and the fluid inlet region 21 of the nozzle of the suction acoustic filter 1 are aligned closer, the effect of concentration of the working fluid flowing directly from the evaporation line becomes greater, It would be a better barrier to working fluid suction encapsulated in the internal environment defined by the hermetic housing of the compressor.

  In connection with the more prominent structural features of the preferred embodiment of the suction acoustic filter 1, the nozzle 2 comprises a module body with respect to the suction acoustic filter 1, i.e. an independent body associated with the suction acoustic filter 1. Preparation is still, but not exclusively, still emphasized preferentially. In this embodiment, the nozzle 2 is fixed to the suction acoustic filter 1 by a sealing type fixing means, for example, sealing and adhesive resin.

  Alternatively, the nozzle 2 can further comprise a body integrated with the suction acoustic filter 1, ie it can be seen that both bodies are part of the same monoblock. In this alternative embodiment, such a monoblock can be made, for example, by a thermoforming process.

  In addition, considering that the preferred embodiment of the suction acoustic filter 1 assumes an inlet path 11 and an outlet 13 in which the inlet path 11 is arranged on the side of the suction acoustic filter 1, the fluid inlet of the nozzle 2 Although 21 is not limited, it is worth mentioning that it is preferable that it is arranged laterally with respect to the suction acoustic filter 1.

  It should still be emphasized here that the suction passage outlet 3 can be directly or indirectly aligned with the fluid inlet region 21 of the nozzle 2 of the suction acoustic filter 1 in relation to the suction line itself. In an indirect alternative method, the use of an extension tube (not shown) is expected.

  Preferentially, the nozzle 2 should contain a maximum volume that is approximately the same as half the volume displaced from the compressor, which is the maximum fluid volume that can be accumulated during the cycle.

  FIG. 11A, which refers to the particular region illustrated in FIGS. 11B and 11C, shows that the suction acoustic filter 1 including the nozzle 2 including the diverging compartment portion 23 is shown because the temperature of the fluid at the outlet of the acoustic filter is lower. Fig. 11C shows a graph that proves to be more thermodynamically effective than an acoustic filter belonging to the current state of technology illustrated in Fig. 11C.

  While multiple embodiments of the subject invention have been described and illustrated, the scope of protection of the subject can encompass other possible variations that are limited only by the claims and are equally possible It should be understood that these means are included herein.

Claims (9)

At least one inlet path (11), at least one acoustic chamber (12), at least one outlet path (13);
At least one fluid inlet region (21) and at least one fluid guide region (22) for the inlet passage (11) of the suction acoustic filter (1), in fluid communication with the at least one inlet passage (11) A suction acoustic filter comprising one nozzle (2),
The nozzle (2) comprises at least a portion of a diverging section (23) associated with the mainstream of discharge (FPE);
Suction acoustic filter, particularly characterized in that said part of the diverging compartment (23) is located between at least one fluid inlet region (21) and at least one fluid guiding region (22).   Suction acoustic filter according to claim 1, characterized in that the part of the divergent section (23) associated with (FPE) comprises a smaller cross-sectional area than the fluid induction region (22).   Suction acoustic filter according to claim 1, characterized in that the nozzle (2) comprises a module body with respect to the suction acoustic filter (1).   The suction acoustic filter according to claim 3, characterized in that the nozzle (2) is fixed to the suction acoustic filter (1) by means of a sealing type fixing means.   Suction acoustic filter according to claim 1, characterized in that the nozzle (2) comprises an integral body of the suction acoustic filter (1).   Suction acoustic filter according to claim 1, characterized in that the fluid inlet (21) of the nozzle (2) is arranged laterally in relation to the suction acoustic filter (1). A suction line comprising a suction acoustic filter comprising at least one suction passage (3) and at least one suction acoustic filter (1),
The suction acoustic filter (1) is in fluid communication with at least one inlet passage (11), at least one acoustic chamber (12), at least one outlet passage (13), and at least one inlet passage (11). And at least one nozzle (2) comprising at least one fluid inlet region (21) and at least one fluid guiding region (22) for the inlet path (11) of the suction acoustic filter (1) A suction line including an acoustic filter,
The nozzle (2) of the suction acoustic filter (1) includes at least a portion of a diverging compartment (23) associated with the main flow (FPE) of the outflow, which portion is at least one fluid inlet region (21) and at least Located between one fluid guiding region (22),
A suction line including a suction acoustic filter, characterized in that the suction passage outlet (3) is arranged adjacent to the fluid inlet region (21) of the nozzle (2) of the suction acoustic filter (1).   Suction acoustic filter according to claim 7, characterized in that the suction passage outlet (3) is arranged directly adjacent to the fluid inlet region (21) of the nozzle (2) of the suction acoustic filter (1). Including suction line.   Suction according to claim 7, characterized in that the suction passage outlet (3) is arranged indirectly adjacent to the fluid inlet region (21) of the nozzle (2) of the suction acoustic filter (1). Suction line including acoustic filter.

Images